TYPEWRITER
| Date | Clue |
|---|---|
| 2015-07-15 | Apt example of this puzzle's theme |
| 2012-07-29 | "Puts the keys of the future at your fingertips" (Philadelphia, 1876) |
| 2007-02-07 | With 49-Across, where 17-, 24- and 39-Across are seen |
| 1999-03-19 | Place to find keys |
| 1994-06-10 | End of the explanation |